I think you're overestimating how much power you need, as most people do. A *DECENT* 500W PSU would do you good, maybe stepping up to 550W. However, if you do want to upgrade in the near future, or do some heavy overclocking, then your current choice is a good one.
maybe this would float your boat: http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016
However, I will say that the PSU you've allready chosen is not a bad choice.